Tom G. Christensen wrote:

The patch did not include the substitution of HAVE_SYS_CDEFS_H needed when
creating sched.h.

Thanks, I missed that. I installed the attached patch; does it fix things for 
you?
>From 1ff19ffcf604b46952f47a19917583ee1f09da8a Mon Sep 17 00:00:00 2001
From: Paul Eggert <egg...@cs.ucla.edu>
Date: Wed, 19 Oct 2016 23:46:10 -0700
Subject: [PATCH] sched: substitute HAVE_SYS_CDEFS_H too

Problem reported by Tom G. Christensen in:
http://lists.gnu.org/archive/html/bug-gnulib/2016-10/msg00084.html
* m4/sched_h.m4 (gl_SCHED_H): Set and substitute HAVE_SYS_CDEFS_H.
* modules/sched (Depends-on): Substitute HAVE_SYS_CDEFS_H.
---
 ChangeLog     | 8 ++++++++
 m4/sched_h.m4 | 9 ++++++++-
 modules/sched | 1 +
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 48f7180..a1a314b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2016-10-19  Paul Eggert  <egg...@cs.ucla.edu>
+
+	sched: substitute HAVE_SYS_CDEFS_H too
+	Problem reported by Tom G. Christensen in:
+	http://lists.gnu.org/archive/html/bug-gnulib/2016-10/msg00084.html
+	* m4/sched_h.m4 (gl_SCHED_H): Set and substitute HAVE_SYS_CDEFS_H.
+	* modules/sched (Depends-on): Substitute HAVE_SYS_CDEFS_H.
+
 2016-10-19  Pádraig Brady  <p...@draigbrady.com>
 
 	quotearg: never write beyond the returned length
diff --git a/m4/sched_h.m4 b/m4/sched_h.m4
index 7192b63..147613b 100644
--- a/m4/sched_h.m4
+++ b/m4/sched_h.m4
@@ -1,4 +1,4 @@
-# sched_h.m4 serial 8
+# sched_h.m4 serial 9
 dnl Copyright (C) 2008-2016 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -48,6 +48,13 @@ AC_DEFUN([gl_SCHED_H],
      fi
      AC_SUBST([HAVE_STRUCT_SCHED_PARAM])
 
+     if test "$ac_cv_header_sys_cdefs_h" = yes; then
+       HAVE_SYS_CDEFS_H=1
+     else
+       HAVE_SYS_CDEFS_H=0
+     fi
+     AC_SUBST([HAVE_SYS_CDEFS_H])
+
      dnl Ensure the type pid_t gets defined.
      AC_REQUIRE([AC_TYPE_PID_T])
     ])
diff --git a/modules/sched b/modules/sched
index 31f9573..b6f2852 100644
--- a/modules/sched
+++ b/modules/sched
@@ -22,6 +22,7 @@ sched.h: sched.in.h $(top_builddir)/config.status
 	{ echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */'; \
 	  sed -e 's|@''GUARD_PREFIX''@|${gl_include_guard_prefix}|g' \
 	      -e 's|@''HAVE_SCHED_H''@|$(HAVE_SCHED_H)|g' \
+	      -e 's|@''HAVE_SYS_CDEFS_H''@|$(HAVE_SYS_CDEFS_H)|g' \
 	      -e 's|@''INCLUDE_NEXT''@|$(INCLUDE_NEXT)|g' \
 	      -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
 	      -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
-- 
2.7.4

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